package com.lsh.payment.core.util;

import org.apache.commons.codec.binary.Base64;

import java.io.*;

/**
 * Project Name: lsh-payment
 * Created by peter on 17/10/27.
 * 北京链商电子商务有限公司
 * Package
 * desc:
 */
public class Img2Base64Util {

    public static void main(String[] args) {
        String imgFile = "/Users/peter/image/6.jpeg";//待处理的图片
        String imgbese = getImgStr(imgFile);
        System.out.println(imgbese.length());
        System.out.println(imgbese);
        String imgFilePath = "/Users/peter/image/6_2.jpeg";//新生成的图片
        generateImage(imgbese, imgFilePath);
    }

    /**
     * 将图片转换成Base64编码
     *
     * @param imgFile 待处理图片
     * @return
     */
    public static String getImgStr(String imgFile) {
        //将图片文件转化为字节数组字符串，并对其进行Base64编码处理
        InputStream in;
        byte[] data = null;
        //读取图片字节数组
        try {
            in = new FileInputStream(imgFile);
            data = new byte[in.available()];
            in.read(data);
            in.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
        System.out.println("data is size " + data.length);
        return new String(Base64.encodeBase64(data));
    }

    /**
     * 对字节数组字符串进行Base64解码并生成图片
     *
     * @param imgStr      图片数据
     * @param imgFilePath 保存图片全路径地址
     * @return
     */
    public static boolean generateImage(String imgStr, String imgFilePath) {
        ////图像数据为空
        if (imgStr == null) {
            return false;
        }

        try {
            //Base64解码
            byte[] b = Base64.decodeBase64(imgStr);
            for (int i = 0; i < b.length; ++i) {
                //调整异常数据
                if (b[i] < 0) {
                    b[i] += 256;
                }
            }
            //生成jpeg图片
            OutputStream out = new FileOutputStream(imgFilePath);
            out.write(b);
            out.flush();
            out.close();
            return true;
        } catch (Exception e) {
            return false;
        }
    }

}
